fixes issue 810 + use single custom target to avoid races copying dynamorio.dll   for Standalone API tests
fixes issue 810
+ use single custom target to avoid races copying dynamorio.dll
  for Standalone API tests

SVN-Revision: 1421

bl4ckic3/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,daksunt/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,daksunt/dynamorio